#include<bits/stdc++.h>
using namespace std;
int a[1000003];
int f(int n){
	a[1]=1;
	for(int i=2;i<=n;++i){
		if(!a[i]){
			a[i]=i;
			for(int j=2;i*j<=n;++j)a[i*j]=i;
		}
	}
}
int main(){
	int n,b;
	cin>>n>>b;
	f(n);
	int ans=0;
	for(int i=1;i<=n;++i)if(a[i]<=b)++ans;
	cout<<ans<<'\n';
}

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